US20150225144A1 - Tube head comprising an insert forming a barrier and allowing the insert to be centered - Google Patents
Tube head comprising an insert forming a barrier and allowing the insert to be centered Download PDFInfo
- Publication number
- US20150225144A1 US20150225144A1 US14/424,242 US201314424242A US2015225144A1 US 20150225144 A1 US20150225144 A1 US 20150225144A1 US 201314424242 A US201314424242 A US 201314424242A US 2015225144 A1 US2015225144 A1 US 2015225144A1
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- US
- United States
- Prior art keywords
- insert
- tube head
- tube
- mandrel
- plastics material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/005—Closures provided with linings or internal coatings so as to avoid contact of the closure with the contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
- B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2618—Moulds having screw-threaded mould walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/02—Body construction
- B65D35/12—Connections between body and closure-receiving bush
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D39/0052—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in more than one piece
- B65D39/0076—Plastic closures other than those covered by groups B65D39/0058 - B65D39/007
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2539/00—Details relating to closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D2539/001—Details of closures arranged within necks or pouring opening or in discharge apertures, e.g. stoppers
- B65D2539/008—Details of closures arranged within necks or pouring opening or in discharge apertures, e.g. stoppers with coatings or coverings
Definitions
- the present invention relates to tubes for storing and distributing products which are typically in paste, liquid or gel form. It is particularly applicable to cosmetic products.
- Flexible tubes are very frequently used for distributing liquids, pastes and gels. In many applications, various types of plastics materials are used to manufacture tubes.
- plastics tubes do not make it possible for certain gases and liquids to be prevented from penetrating into the tube, thereby altering the contents of the tube, or, on the contrary, they do not allow certain components of the contents of the tube to be prevented from leaking out, thereby leading to the product itself being degraded.
- An insert which is also known as a washer, is thus conventionally incorporated into the tube head in order to form a protective barrier.
- This insert typically comprises a metal layer, which makes it possible to achieve this barrier effect.
- This corrosion may contaminate the contents of the tube, alter the capacity of the tube to protect the product and render it unsightly, and this is problematic in particular in the field of cosmetic products, in which the appearance of the product plays an important role.
- the present invention aims to propose a tube-head structure which does not have such drawbacks, as well as a mould for manufacturing such a tube head.
- the present invention proposes a tube head for a product having a liquid to pasty consistency, said tube head being produced from plastics material and being capable of being connected to a skirt so as to form a tube having an internal volume, and comprising
- said tube head has one or more of the following features, taken in isolation or in combination:
- the invention also relates to a tube for a product having a liquid to pasty consistency, comprising a tube head according to any of the preceding claims.
- the invention also relates to a mould for manufacturing a tube head made of plastics material comprising an insert forming a barrier, said mould comprising:
- said mould has one or more of the following features, taken in isolation or in combination:
- FIG. 1 is a partial section through a tube according to an aspect of the invention
- FIGS. 2 and 3 are details of portions of FIG. 1 .
- FIG. 4 is an exploded view of the tube head shown in FIG. 1 and of a part of the tool adapted for the manufacture thereof,
- FIG. 5 is a side view of the tool shown in FIG. 4 .
- FIGS. 6 to 9 are sections of several steps of a method for manufacturing a tube head according to one aspect of the invention.
- FIG. 10 is a section through the tube head along an axis X-X defined in FIG. 9 ,
- FIGS. 11 and 12 are each a section through a portion of the tube head according to an aspect of the invention.
- FIG. 13 is a detail of an example of the insert structure.
- FIG. 1 is a partial section through a tube 10 according to an aspect of the invention
- FIGS. 2 and 3 are details of portions of FIG. 1 .
- the tube 10 comprises a tube head 12 connected to a skirt 14 forming a tubular body 16 , which is connected to the head 12 at a first end 20 and closed at a second end 18 opposite the first end 20 .
- a longitudinal axis of the tube 10 is defined, shown by the axis Z in FIG. 1 , and is also shown in the following figures.
- the tube head 12 comprises a body 22 made of plastics material having a neck 26 which has an inner passage 28 and opens out at a free end 30 .
- the neck 26 has an external thread 32 so as to cooperate with a cap 34 comprising a complementary internal thread for closing the tube 10 .
- a shoulder 36 extends from an end 38 of the neck 26 opposite the free end 30 thereof, the neck 26 and the shoulder 36 being formed in one piece.
- the shoulder 36 defines an inner surface 40 which is directed towards the internal volume 42 of the tube 10 .
- the tube head 12 is connected to the skirt 14 , typically by overmoulding the tube head 12 on the skirt 14 , or for example by welding or bonding, by mounting the skirt 14 on the previously formed tube head 12 , in particular by injection or by compression injection, or by any other method.
- the skirt 14 is typically made of plastics material and/or laminated metal, for example a multi-layer assembly comprising one or more layers of metal material such as aluminium, and one or more plastics layers, such compositions being well known to a person skilled in the art.
- the tube head 12 further comprises an insert 44 , which covers a portion 45 of an inner surface 40 of the shoulder 26 .
- the insert 44 typically comprises a metal layer 100 , for example an aluminium layer, which is arranged between two protective layers 101 made of plastics material which cover the two opposite surfaces of the aluminium layer 100 , as shown in FIG. 13 .
- the insert 44 as shown is a disc which comprises a central opening 50 and is in the shape of a truncated cone. Upper and lower surfaces and an inner edge 54 and an outer edge 56 of the insert 44 , between which the insert 44 is substantially linear, are thus defined. As stated above, said inner edge 54 and outer edge 56 are typically points of weakness of the insert, in that the metal layer forming the insert 44 may be accessible at these points, thereby exposing said layer to corrosion by the product contained in the tube 10 .
- the outer edge 56 of the insert 44 is surrounded with plastics material which forms the tube head, in particular via a support 60 which covers the outer edge 56 of the insert 44 and a portion 62 of the outer periphery of the face of the insert 44 which is oriented towards the internal volume 42 of the tube 10 .
- the support 60 thus forms a shoulder in the region of the outer edge 56 of the insert 44 , such that the insert 44 is held between the shoulder 36 of the tube head 12 and the outer support 60 over a portion 62 of its length which is adjacent to its outer edge 56 .
- the tube head 12 also comprises an inner support 132 which is similar to the outer support 60 set out above and covers the inner edge 54 of the insert 44 with plastics material, as well as a portion 64 of the face of the insert 44 which is oriented towards the internal volume 42 of the tube 10 and is adjacent to the inner edge 54 .
- the inner edge 54 of the insert 44 is thus held between the shoulder 36 of the tube head 12 and the inner support 132 over a portion of its length which is adjacent to its inner edge 54 .
- This inner support 132 ensures that the inner edge 54 of the insert 44 is protected against corrosion, which may result from contact with the product contained in the internal volume 42 of the tube 10 .
- a length Li which corresponds to the length of the insert 44 which is covered by the inner support 132 , and the width E and the thickness H of the inner support 132 are defined. These dimensions are advantageously such that E is greater than or equal to Li, and/or H is greater than or equal to Li, so as to ensure that the inner edge 54 of the insert 44 remains surrounded by the inner support 132 even if the inner edge 54 folds over, for example during injection.
- the thickness H is defined as the average thickness of the inner support 132 , which is measured from the face of the insert 44 which is oriented towards the internal volume 42 of the tube 10 in a direction which is parallel to the longitudinal direction Z of the tube 10 , over the length Li of the face of the insert 44 which is oriented towards the internal volume 42 of the tube 10 and is covered by the inner support 132 , prior to possible deformation of the insert 44 .
- This average thickness of the inner support 132 is thus calculated over the entire length Li of the portion 64 of the inner periphery of the face of the insert which is oriented towards the internal volume 42 of the tube 10 and is covered by the inner support 132 , prior to possible deformation of the insert 44 .
- a joining point 65 is defined at the joint between the insert 44 and the inner support 132 , this joining point 65 being the point on the inner face of the insert 44 which is oriented towards the interior 42 of the tube 10 that is the outermost in the radial direction relative to the axis Z which is covered by the inner support 132 .
- the width E is measured perpendicularly to the axis Z, from the joining point 65 of the inner face of the insert 44 which is oriented towards the interior 42 of the tube 10 .
- the inner support 132 is advantageously dimensioned such that the relationship(s) H ⁇ Li and/or E ⁇ Li is/are satisfied even if there are imperfections during cutting or centring of the insert 44 .
- the thickness H and the width E of the inner support 132 are thus dimensioned so as to take into account significant tolerances during cutting of the insert 44 .
- FIG. 4 is an exploded view of the tube head 12 , the insert 44 and a mandrel 106 (or, more generally, a male tool) of the mould 100 for producing the tube head 12 .
- the mandrel 106 comprises a substantially cylindrical head portion 108 which is adapted so as to form the inner surface of the neck 26 of the tube head 12 , and a substantially frustoconical shoulder 114 which is adapted to form the inner surface of the shoulder 36 of the tube head 12 .
- the head 108 of the mandrel 106 has a free end 110 , which is typically provided with a chamfer 112 in order not to have a sharp angle.
- the head 108 of the mandrel 106 comprises volumes forming projections, said volumes being adapted to position the insert 44 when it is arranged on the mandrel 108 .
- the head 108 of the mandrel 106 comprises one or more centring ribs 118 which extend in the longitudinal direction of the head 108 , for example three or six ribs which are uniformly distributed over the periphery of the head 108 .
- the mandrel 106 further comprises a peripheral groove 122 which extends substantially at the base of the head 108 of the mandrel 106 , in the region of the joint between the head 108 and the shoulder 114 , allowing the base of the neck of the tube head 12 to be formed, and the inner support 132 covering a portion of the face of the insert 44 which is oriented towards the internal volume 42 of the tube 10 and is adjacent to the inner edge 54 of the insert 44 .
- FIGS. 6 to 9 An example of the use of such a mandrel is shown in FIGS. 6 to 9 .
- FIG. 6 is a section through a mandrel 106 as described above with reference to FIGS. 4 and 5 .
- FIG. 7 shows the mandrel 106 , on which an insert 44 as described above is arranged.
- the insert 44 is supported against the shoulder 114 of the mandrel 106 and is centred around the head 108 of the mandrel 106 via the centring ribs 118 which bear against the inner edge 54 of the insert 44 .
- FIG. 8 shows the mandrel 106 and the insert 44 combined with a female mould part 102 which defines a cavity into which the mandrel 106 is inserted and an injection channel 128 which is typically arranged so as to be positioned in the region of the free end 30 of the tube head 12 .
- the mandrel 106 and the female mould part 102 thus define an inner space into which the material forming the tube head 12 is injected.
- the skirt 14 is positioned in the mould prior to injection, so as to overmould the tube head 12 on the skirt 14 .
- the injected plastics material partially covers the insert 44 , that is to say covers the face thereof that is opposite the internal volume 42 of the tube 10 , the inner edge 54 and outer edge 56 , and the two positions that are adjacent to these edges and are oriented towards the internal volume 42 of the tube 10 .
- FIG. 9 shows the tube head 12 thus formed together with the mandrel 106 , the female mould part 102 having been removed.
- a plane X-X is shown in this figure, which defines the sectional plane of the tube head 12 in FIG. 10 .
- FIG. 10 is a section along the plane X-X as defined above through the tube head 12 , and emphasises the geometry of the neck 26 of the tube head 12 and in particular the positioning of the insert 44 .
- This figure more particularly shows the effect of the centring ribs 118 of the mandrel 106 on the neck 26 of the tube head 12 and the grooves 136 which result therefrom.
- These grooves 136 define points in the region of which the insert 44 is directly accessible and is not covered by the material forming the tube head 12 .
- the inner edge 54 of the insert 44 is covered with plastics material, thus protecting said edge against corrosion.
- a thin layer of plastics material may cover the regions of the insert which bear against the ribs 118 of the mandrel 106 , such a thin layer of plastics material not forming an effective covering of the insert 44 .
- FIGS. 11 and 12 are each a section through a portion of the tube head as set out above, FIG. 11 being a section along a plane passing through a groove 136 which is described above, whereas the sectional plane used for FIG. 12 does not pass through such a groove 136 .
- the values Li, H and E are shown in these two figures. It can be clearly seen that the thickness E of the inner support 132 is lower In the region of a groove 136 , the thickness of the inner support 132 being reduced by the depth of the groove 136 .
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Abstract
Description
- The present invention relates to tubes for storing and distributing products which are typically in paste, liquid or gel form. It is particularly applicable to cosmetic products.
- Flexible tubes are very frequently used for distributing liquids, pastes and gels. In many applications, various types of plastics materials are used to manufacture tubes.
- A recurring problem with plastics tubes is that they do not make it possible for certain gases and liquids to be prevented from penetrating into the tube, thereby altering the contents of the tube, or, on the contrary, they do not allow certain components of the contents of the tube to be prevented from leaking out, thereby leading to the product itself being degraded. In order to solve this problem, it has been proposed to provide obstacles, in particular in the region of the tube head, to prevent undesirable components from entering and exiting through the tube head.
- An insert, which is also known as a washer, is thus conventionally incorporated into the tube head in order to form a protective barrier.
- This insert typically comprises a metal layer, which makes it possible to achieve this barrier effect.
- However, this solution of adding an insert presents another problem arising from the insert itself. It has in fact been noted that certain products which may be contained in tubes corrode the metal insert, in particular at the edges thereof.
- This corrosion may contaminate the contents of the tube, alter the capacity of the tube to protect the product and render it unsightly, and this is problematic in particular in the field of cosmetic products, in which the appearance of the product plays an important role.
- Several solutions have been proposed for protecting the insert, and in particular the edges thereof, against the risk of corrosion, for example by folding the edges of the washer over on themselves, but these solutions are not entirely satisfactory either because of their impact on the barrier effect of the insert or because of the associated technical constraints. Furthermore, during injection of the plastics material forming the tube head, the insert is deformed, in particular at the ends thereof, thereby having an impact on the covering and thus possibly leading to inserts which have exposed ends, and therefore meaning that the problem of corrosion of the metal layer of the insert resurfaces.
- The present invention aims to propose a tube-head structure which does not have such drawbacks, as well as a mould for manufacturing such a tube head.
- For this purpose, the present invention proposes a tube head for a product having a liquid to pasty consistency, said tube head being produced from plastics material and being capable of being connected to a skirt so as to form a tube having an internal volume, and comprising
-
- a neck having, at a first end, an opening through which a product is removed from the tube,
- a shoulder connected to a second end of the neck opposite the first end,
- an insert forming a barrier which is arranged on the inner surface of the shoulder, said insert comprising at least one metal layer and having an outer edge which is covered in a continuous manner by an outer support made of plastics material forming the tube head, and an inner hole defining an inner edge,
characterised in that the inner edge of the insert is covered in a discontinuous manner by the plastics material forming the tube head, such that a portion of the face of the insert which is oriented towards the internal volume of the tube and is adjacent to said inner edge is covered by an inner support.
- In a variant, said tube head has one or more of the following features, taken in isolation or in combination:
-
- said insert is linear between the inner edge and the outer edge thereof,
- the inner hole is aligned with the neck,
- the covering of the inner edge (54) of the insert (44) is interrupted by at least one groove,
- the covering of the inner edge (54) of the insert (44) is interrupted by at least three grooves, said grooves being uniformly distributed over the neck,
- the covering of the inner edge of the insert is interrupted by six grooves in the covering of the inner edge, said grooves being uniformly distributed over the neck,
- said insert is in the shape of a truncated cone, which converges from the outer edge towards the inner edge thereof,
- said insert comprises at least three superposed layers, these being an upper layer made of plastics material, an inner metal layer, and a lower layer made of plastics material.
- The invention also relates to a tube for a product having a liquid to pasty consistency, comprising a tube head according to any of the preceding claims.
- The invention also relates to a mould for manufacturing a tube head made of plastics material comprising an insert forming a barrier, said mould comprising:
-
- a mandrel forming a male mould part, said mandrel comprising a substantially cylindrical head for forming the neck, and a shoulder extending from said head,
- a female mould part which defines a cavity into which the mandrel is inserted, and an injection channel, said mould being characterised in that
- the mandrel is adapted to allow an insert to be positioned on said mandrel such that the injection of plastics material into the mould surrounds said insert in a discontinuous manner and in that a portion of the face of the insert which is oriented towards the shoulder of the mandrel and is adjacent to said inner edge is covered with plastics material during injection.
- In a variant, said mould has one or more of the following features, taken in isolation or in combination:
-
- said mandrel comprises at least three centring ribs which extend longitudinally on said head,
- said centring ribs are adapted to allow an insert to be positioned on said mandrel such that the injection of plastics material into the mould surrounds said insert in a discontinuous manner, the regions of the insert which are in contact with said ribs not being covered with plastics material,
- said mandrel comprises a peripheral groove at the joint between the head and the shoulder,
- said peripheral groove is adapted such that a portion of the face of the insert which is oriented towards the shoulder of the mandrel and is adjacent to said inner edge is covered with plastics material during injection,
- said shoulder is in the shape of a truncated cone, so as to receive an insert which is in the shape of a truncated cone, and converges from the outer edge towards the inner edge thereof.
- Other features, aims and advantages of the invention will become clearer from the following description which is given purely by way of illustrative and non-limiting example and should be read with reference to the accompanying drawings, in which:
-
FIG. 1 is a partial section through a tube according to an aspect of the invention, -
FIGS. 2 and 3 are details of portions ofFIG. 1 , -
FIG. 4 is an exploded view of the tube head shown inFIG. 1 and of a part of the tool adapted for the manufacture thereof, -
FIG. 5 is a side view of the tool shown inFIG. 4 , -
FIGS. 6 to 9 are sections of several steps of a method for manufacturing a tube head according to one aspect of the invention, -
FIG. 10 is a section through the tube head along an axis X-X defined inFIG. 9 , -
FIGS. 11 and 12 are each a section through a portion of the tube head according to an aspect of the invention, -
FIG. 13 is a detail of an example of the insert structure. - In all the drawings, identical elements are provided with identical reference numerals.
-
FIG. 1 is a partial section through atube 10 according to an aspect of the invention;FIGS. 2 and 3 are details of portions ofFIG. 1 . - The
tube 10 comprises atube head 12 connected to askirt 14 forming atubular body 16, which is connected to thehead 12 at afirst end 20 and closed at asecond end 18 opposite thefirst end 20. - A longitudinal axis of the
tube 10 is defined, shown by the axis Z inFIG. 1 , and is also shown in the following figures. - The
tube head 12 comprises abody 22 made of plastics material having aneck 26 which has aninner passage 28 and opens out at afree end 30. - The
neck 26 has anexternal thread 32 so as to cooperate with acap 34 comprising a complementary internal thread for closing thetube 10. - A
shoulder 36 extends from anend 38 of theneck 26 opposite thefree end 30 thereof, theneck 26 and theshoulder 36 being formed in one piece. - The
shoulder 36 defines aninner surface 40 which is directed towards theinternal volume 42 of thetube 10. - The
tube head 12 is connected to theskirt 14, typically by overmoulding thetube head 12 on theskirt 14, or for example by welding or bonding, by mounting theskirt 14 on the previously formedtube head 12, in particular by injection or by compression injection, or by any other method. - The
skirt 14 is typically made of plastics material and/or laminated metal, for example a multi-layer assembly comprising one or more layers of metal material such as aluminium, and one or more plastics layers, such compositions being well known to a person skilled in the art. - The
tube head 12 further comprises aninsert 44, which covers aportion 45 of aninner surface 40 of theshoulder 26. - The
insert 44 typically comprises ametal layer 100, for example an aluminium layer, which is arranged between twoprotective layers 101 made of plastics material which cover the two opposite surfaces of thealuminium layer 100, as shown inFIG. 13 . - The
insert 44 as shown is a disc which comprises acentral opening 50 and is in the shape of a truncated cone. Upper and lower surfaces and aninner edge 54 and anouter edge 56 of theinsert 44, between which theinsert 44 is substantially linear, are thus defined. As stated above, saidinner edge 54 andouter edge 56 are typically points of weakness of the insert, in that the metal layer forming theinsert 44 may be accessible at these points, thereby exposing said layer to corrosion by the product contained in thetube 10. - It is understood that the present invention may also apply to an
insert 44 which is flat and integrated into a tube head having a substantially planar shoulder. - As shown in the drawings, the
outer edge 56 of theinsert 44 is surrounded with plastics material which forms the tube head, in particular via asupport 60 which covers theouter edge 56 of theinsert 44 and aportion 62 of the outer periphery of the face of theinsert 44 which is oriented towards theinternal volume 42 of thetube 10. - The
support 60 thus forms a shoulder in the region of theouter edge 56 of theinsert 44, such that theinsert 44 is held between theshoulder 36 of thetube head 12 and theouter support 60 over aportion 62 of its length which is adjacent to itsouter edge 56. - In the same way, the
tube head 12 also comprises aninner support 132 which is similar to theouter support 60 set out above and covers theinner edge 54 of theinsert 44 with plastics material, as well as aportion 64 of the face of theinsert 44 which is oriented towards theinternal volume 42 of thetube 10 and is adjacent to theinner edge 54. - The
inner edge 54 of theinsert 44 is thus held between theshoulder 36 of thetube head 12 and theinner support 132 over a portion of its length which is adjacent to itsinner edge 54. Thisinner support 132 ensures that theinner edge 54 of theinsert 44 is protected against corrosion, which may result from contact with the product contained in theinternal volume 42 of thetube 10. - A length Li, which corresponds to the length of the
insert 44 which is covered by theinner support 132, and the width E and the thickness H of theinner support 132 are defined. These dimensions are advantageously such that E is greater than or equal to Li, and/or H is greater than or equal to Li, so as to ensure that theinner edge 54 of theinsert 44 remains surrounded by theinner support 132 even if theinner edge 54 folds over, for example during injection. - The thickness H is defined as the average thickness of the
inner support 132, which is measured from the face of theinsert 44 which is oriented towards theinternal volume 42 of thetube 10 in a direction which is parallel to the longitudinal direction Z of thetube 10, over the length Li of the face of theinsert 44 which is oriented towards theinternal volume 42 of thetube 10 and is covered by theinner support 132, prior to possible deformation of theinsert 44. - This average thickness of the
inner support 132 is thus calculated over the entire length Li of theportion 64 of the inner periphery of the face of the insert which is oriented towards theinternal volume 42 of thetube 10 and is covered by theinner support 132, prior to possible deformation of theinsert 44. - A joining
point 65 is defined at the joint between theinsert 44 and theinner support 132, this joiningpoint 65 being the point on the inner face of theinsert 44 which is oriented towards the interior 42 of thetube 10 that is the outermost in the radial direction relative to the axis Z which is covered by theinner support 132. - The width E is measured perpendicularly to the axis Z, from the joining
point 65 of the inner face of theinsert 44 which is oriented towards the interior 42 of thetube 10. - In addition, the
inner support 132 is advantageously dimensioned such that the relationship(s) H≧Li and/or E≧Li is/are satisfied even if there are imperfections during cutting or centring of theinsert 44. - The thickness H and the width E of the
inner support 132 are thus dimensioned so as to take into account significant tolerances during cutting of theinsert 44. - The method for manufacturing the
tube head 12 as set out above and the positioning of the insert in thetube head 12 are described in detail with reference toFIGS. 4 to 10 . -
FIG. 4 is an exploded view of thetube head 12, theinsert 44 and a mandrel 106 (or, more generally, a male tool) of themould 100 for producing thetube head 12. - The
mandrel 106 comprises a substantiallycylindrical head portion 108 which is adapted so as to form the inner surface of theneck 26 of thetube head 12, and a substantiallyfrustoconical shoulder 114 which is adapted to form the inner surface of theshoulder 36 of thetube head 12. Thehead 108 of themandrel 106 has afree end 110, which is typically provided with achamfer 112 in order not to have a sharp angle. - As shown in
FIGS. 4 and 5 , thehead 108 of themandrel 106 comprises volumes forming projections, said volumes being adapted to position theinsert 44 when it is arranged on themandrel 108. - More specifically, the
head 108 of themandrel 106 comprises one ormore centring ribs 118 which extend in the longitudinal direction of thehead 108, for example three or six ribs which are uniformly distributed over the periphery of thehead 108. - The
mandrel 106 further comprises aperipheral groove 122 which extends substantially at the base of thehead 108 of themandrel 106, in the region of the joint between thehead 108 and theshoulder 114, allowing the base of the neck of thetube head 12 to be formed, and theinner support 132 covering a portion of the face of theinsert 44 which is oriented towards theinternal volume 42 of thetube 10 and is adjacent to theinner edge 54 of theinsert 44. - An example of the use of such a mandrel is shown in
FIGS. 6 to 9 . -
FIG. 6 is a section through amandrel 106 as described above with reference toFIGS. 4 and 5 . -
FIG. 7 shows themandrel 106, on which aninsert 44 as described above is arranged. - The
insert 44 is supported against theshoulder 114 of themandrel 106 and is centred around thehead 108 of themandrel 106 via thecentring ribs 118 which bear against theinner edge 54 of theinsert 44. -
FIG. 8 shows themandrel 106 and theinsert 44 combined with afemale mould part 102 which defines a cavity into which themandrel 106 is inserted and aninjection channel 128 which is typically arranged so as to be positioned in the region of thefree end 30 of thetube head 12. - The
mandrel 106 and thefemale mould part 102 thus define an inner space into which the material forming thetube head 12 is injected. - In the embodiment shown, the
skirt 14 is positioned in the mould prior to injection, so as to overmould thetube head 12 on theskirt 14. - As can be seen in the drawings, the injected plastics material partially covers the
insert 44, that is to say covers the face thereof that is opposite theinternal volume 42 of thetube 10, theinner edge 54 andouter edge 56, and the two positions that are adjacent to these edges and are oriented towards theinternal volume 42 of thetube 10. -
FIG. 9 shows thetube head 12 thus formed together with themandrel 106, thefemale mould part 102 having been removed. - A plane X-X is shown in this figure, which defines the sectional plane of the
tube head 12 inFIG. 10 . -
FIG. 10 is a section along the plane X-X as defined above through thetube head 12, and emphasises the geometry of theneck 26 of thetube head 12 and in particular the positioning of theinsert 44. - This figure more particularly shows the effect of the
centring ribs 118 of themandrel 106 on theneck 26 of thetube head 12 and thegrooves 136 which result therefrom. Thesegrooves 136 define points in the region of which theinsert 44 is directly accessible and is not covered by the material forming thetube head 12. As can be seen fromFIG. 10 , with the exception of thegrooves 136, theinner edge 54 of theinsert 44 is covered with plastics material, thus protecting said edge against corrosion. - Since the regions of possible contact between the
inner edge 54 of theinsert 44 and the product contained in thetube 10 are limited to the grooves, they are therefore greatly reduced, thereby making the risk of corrosion of theinsert 44 very low while allowing theinsert 44 to be centred on themould 100 for injection. - In addition, it is understood that owing to the working clearance that results from the manufacturing of different parts (in particular the insert 44) and is necessary to allow the
insert 44 to be positioned on themandrel 106, a thin layer of plastics material may cover the regions of the insert which bear against theribs 118 of themandrel 106, such a thin layer of plastics material not forming an effective covering of theinsert 44. -
FIGS. 11 and 12 are each a section through a portion of the tube head as set out above,FIG. 11 being a section along a plane passing through agroove 136 which is described above, whereas the sectional plane used forFIG. 12 does not pass through such agroove 136. - The values Li, H and E are shown in these two figures. It can be clearly seen that the thickness E of the
inner support 132 is lower In the region of agroove 136, the thickness of theinner support 132 being reduced by the depth of thegroove 136. - The relationships H≧Li and/or E≧Li are advantageously satisfied whether in the region of a
groove 136 or not, thus ensuring that theinner edge 54 of theinsert 44 is protected, even in the region of thegrooves 136. - It can of course be seen in these figures that even if the
insert 44 bends in the region of itsinner edge 54, said edge will remain surrounded by theinner support 132 owing to the above-mentioned relationships between the values H, Li and E.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1258053 | 2012-08-28 | ||
FR1258053A FR2994949B1 (en) | 2012-08-28 | 2012-08-28 | IMPROVED TUBE HEAD COMPRISING AN INSERT FORMING A BARRIER AND ALLOWING CENTERING THEREOF |
PCT/EP2013/065889 WO2014032880A1 (en) | 2012-08-28 | 2013-07-29 | Improved tube head comprising a barrier-forming insert, allowing centering of the insert |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150225144A1 true US20150225144A1 (en) | 2015-08-13 |
US10023368B2 US10023368B2 (en) | 2018-07-17 |
Family
ID=47624206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/424,242 Expired - Fee Related US10023368B2 (en) | 2012-08-28 | 2013-07-29 | Tube head comprising an insert forming a barrier and allowing the insert to be centered |
Country Status (5)
Country | Link |
---|---|
US (1) | US10023368B2 (en) |
EP (1) | EP2890619B1 (en) |
FR (1) | FR2994949B1 (en) |
PL (1) | PL2890619T3 (en) |
WO (1) | WO2014032880A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568001A (en) * | 1982-11-12 | 1986-02-04 | Automation Industrielle Sa | Packaging tube |
US4664284A (en) * | 1981-05-07 | 1987-05-12 | Kmk Karl Magerle Lizenz | Container of tubular form |
US5035349A (en) * | 1990-02-26 | 1991-07-30 | Betts Packaging Inc. | Multi-component striping paste dispenser |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3295725A (en) * | 1962-12-07 | 1967-01-03 | American Can Co | Collapsible dispensing container with an impermeable barrier both in its laminated wall and in its headpiece |
-
2012
- 2012-08-28 FR FR1258053A patent/FR2994949B1/en not_active Expired - Fee Related
-
2013
- 2013-07-29 US US14/424,242 patent/US10023368B2/en not_active Expired - Fee Related
- 2013-07-29 EP EP13741784.6A patent/EP2890619B1/en not_active Not-in-force
- 2013-07-29 PL PL13741784T patent/PL2890619T3/en unknown
- 2013-07-29 WO PCT/EP2013/065889 patent/WO2014032880A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4664284A (en) * | 1981-05-07 | 1987-05-12 | Kmk Karl Magerle Lizenz | Container of tubular form |
US4568001A (en) * | 1982-11-12 | 1986-02-04 | Automation Industrielle Sa | Packaging tube |
US5035349A (en) * | 1990-02-26 | 1991-07-30 | Betts Packaging Inc. | Multi-component striping paste dispenser |
Also Published As
Publication number | Publication date |
---|---|
WO2014032880A1 (en) | 2014-03-06 |
PL2890619T3 (en) | 2017-08-31 |
FR2994949A1 (en) | 2014-03-07 |
EP2890619B1 (en) | 2016-07-13 |
EP2890619A1 (en) | 2015-07-08 |
US10023368B2 (en) | 2018-07-17 |
FR2994949B1 (en) | 2014-08-29 |
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